In my research, I am interested on deriving a [very] detailed vegetation and elevation maps, for this purpose I considered the use of drones (UAV). I do not mean to develop a drone but to acquire a commercial one. My study area is located on the Andes (about 4200 m.a.s.l) and a few years ago we had lifting problems with a prototype (when drones were not that popular), since the air seemed to be thinner than the drone's requirement.
Based on previous expertise or researches could you recommend a drone series/model/brand capable to achieve this task on this environment?
My main field of expertise is not UAVs.